1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "device/hid/hid_service.h"
6
7#include "base/lazy_instance.h"
8#include "base/logging.h"
9#include "base/memory/scoped_vector.h"
10#include "base/stl_util.h"
11#include "base/threading/thread_restrictions.h"
12
13#if defined(OS_LINUX) && defined(USE_UDEV)
14#include "device/hid/hid_service_linux.h"
15#elif defined(OS_MACOSX)
16#include "device/hid/hid_service_mac.h"
17#else
18#include "device/hid/hid_service_win.h"
19#endif
20
21namespace device {
22
23namespace {
24
25// The instance will be reset when message loop destroys.
26base::LazyInstance<scoped_ptr<HidService> >::Leaky g_hid_service_ptr =
27    LAZY_INSTANCE_INITIALIZER;
28
29}  // namespace
30
31void HidService::GetDevices(std::vector<HidDeviceInfo>* devices) {
32  DCHECK(thread_checker_.CalledOnValidThread());
33  STLClearObject(devices);
34  for (DeviceMap::iterator it = devices_.begin();
35      it != devices_.end();
36      ++it) {
37    devices->push_back(it->second);
38  }
39}
40
41// Fills in the device info struct of the given device_id.
42bool HidService::GetDeviceInfo(const HidDeviceId& device_id,
43                               HidDeviceInfo* info) const {
44  DeviceMap::const_iterator it = devices_.find(device_id);
45  if (it == devices_.end())
46    return false;
47  *info = it->second;
48  return true;
49}
50
51void HidService::WillDestroyCurrentMessageLoop() {
52  DCHECK(thread_checker_.CalledOnValidThread());
53  g_hid_service_ptr.Get().reset(NULL);
54}
55
56HidService::HidService() {
57  base::ThreadRestrictions::AssertIOAllowed();
58  DCHECK(thread_checker_.CalledOnValidThread());
59  base::MessageLoop::current()->AddDestructionObserver(this);
60}
61
62HidService::~HidService() {
63  DCHECK(thread_checker_.CalledOnValidThread());
64  base::MessageLoop::current()->RemoveDestructionObserver(this);
65}
66
67HidService* HidService::CreateInstance() {
68#if defined(OS_LINUX) && defined(USE_UDEV)
69    return new HidServiceLinux();
70#elif defined(OS_MACOSX)
71    return new HidServiceMac();
72#elif defined(OS_WIN)
73    return new HidServiceWin();
74#else
75    return NULL;
76#endif
77}
78
79void HidService::AddDevice(const HidDeviceInfo& info) {
80  DCHECK(thread_checker_.CalledOnValidThread());
81  if (!ContainsKey(devices_, info.device_id)) {
82    devices_[info.device_id] = info;
83  }
84}
85
86void HidService::RemoveDevice(const HidDeviceId& device_id) {
87  DCHECK(thread_checker_.CalledOnValidThread());
88  DeviceMap::iterator it = devices_.find(device_id);
89  if (it != devices_.end())
90    devices_.erase(it);
91}
92
93HidService* HidService::GetInstance() {
94  if (!g_hid_service_ptr.Get().get())
95    g_hid_service_ptr.Get().reset(CreateInstance());
96  return g_hid_service_ptr.Get().get();
97}
98
99}  // namespace device
100